Electrical switching apparatus employing a circuit for selective

Details Electrical switching apparatus employing a circuit for selective Electrical switching apparatus employing a circuit for selective

1998-05-11

1999-08-10

Medley, Sally C.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Automatic reclosing

361 93, H01H 7700

Patent

active

059368179

ABSTRACT:
A circuit breaker includes separable contacts for movement between a closed position and an open position, and an operating mechanism for moving the separable contacts between the closed and open positions. Current transformers and potential transformers sense current, voltage and frequency conditions of the separable contacts and produce signals corresponding to those electrical conditions. A trip unit employs those signals corresponding to the electrical conditions to produce a trip signal. A trip coil employs the trip signal to actuate the operating mechanism to move the separable contacts to the open position. A closing mechanism produces a close signal, and a close actuator mechanism employs the close signal to actuate the operating mechanism to move the separable contacts to the closed position. The trip unit includes a microprocessor-based firmware routine for selectively enabling and disabling the close actuator mechanism as a function of the signals corresponding to the electrical conditions.

REFERENCES:
patent: 4751606 (1988-06-01), Matsko et al.
patent: 5270898 (1993-12-01), Elms et al.
patent: 5341191 (1994-08-01), Crookston et al.
patent: 5357394 (1994-10-01), Piney
patent: 5420799 (1995-05-01), Peterson et al.
patent: 5600527 (1997-02-01), Engel et al.

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